Pre-melting refining slag, also known as pre-refining slag, is a type of slag that is used in the metallurgical industry during the refining process of metal production. It is typically added to the molten metal before the actual melting process begins.
The purpose of pre-melting refining slag is to remove impurities from the metal and improve its quality. It acts as a reactive agent that reacts with various impurities present in the molten metal, such as sulfur, phosphorus, and non-metallic inclusions. These impurities form compounds with the slag, which are then separated from the metal during the refining process.

Pre-melting refining slag has a high melting point and viscosity, allowing it to effectively capture and absorb impurities. It also helps in controlling the composition and temperature of the molten metal, ensuring optimal conditions for refining.

The specific composition of pre-melting refining slag can vary depending on the type of metal being refined and the impurities present. Common components of this slag may include lime (CaO), silica (SiO2), alumina (Al2O3), and fluxes like calcium fluoride (CaF2) or calcium oxide (CaO).
Overall, pre-melting refining slag plays a crucial role in the purification and quality enhancement of metals during the refining process, contributing to the production of high-quality and low-impurity metal products.

Pre-Melting Refining Slag

1. The composition of premelted refining slag is uniform. It has better fluidity and has excellent comprehensive metallurgical effects, such as deoxidation, desulfurization and adsorption of impurities.

2. The pre-melting refining slag has a low melting point and a fast melting speed, which shortens the refining time, thereby shortening the entire time of steelmaking. It also improves the quality of molten steel and reduces slag consumption. At the same time, electricity consumption in steelmaking and the consumption of ladle refractories have also been reduced.

3. The advanced melting process makes the components of the refining slag to form a homogeneous compound, which makes it have strong component homogeneity and stable use performance.The uniform refining slag does not absorb moisture, which is convenient for storage and long-distance transportation.

4.  After the pre-melting treatment, the refining slag can be broken into a certain particle size as required. This makes it difficult to generate dust during use and transportation, which greatly improves the production environment of  the refining workshop.